Barrel monitor



FIG. 1 is a front perspective view of a barrel monitor showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof,

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top perspective view thereof, showing the bottom portion of the barrel monitor separate from the top portion for clarity of illustration; and,

FIG. 9 is a front elevation view thereof, showing a barrel to provide example environment.

The dashed broken line showing of a barrel in FIG. 9 is for the purpose of illustrating environmental structure that forms no part of the claimed design. The remaining dashed broken lines in the figures illustrate portions of the barrel monitor that form no part of the claimed design. 

CLAIM The ornamental design for a barrel monitor, as shown and described. 